This is like me claiming I have a pet dragon in my garage that can't be photographed or he dissapears.
Can you prove I don't?
It's almost impossible to prove a negative (ask Christianity, they lean on that premise almost exclusively).
I don't believe the people claiming they did nothing but put the phone in a front pocket. I have plenty of reasons not to, and they have a ton of reasons to lie about it (embarrassment over damaging their own phone through their own negligence for one).
There are MILLIONS of these phones in the wild. There aren't even 100 reported cases of "bending", regardless of the cause.
Could it happen? Sure. You CAN bend your phone. No one is disputing that. What is in dispute is how hard it needs to be pushed, and under what circumstance it will bend.
For 99.9999% of folks, it's a NON-issue. I completely understand wanting to save face if you sit on your phone. That does NOT make it anyone's fault but yours.
There IS no problem. Prove me wrong.